Combining RT With Immunotherapy and Chemotherapy in Metastatic Nasopharyngeal Carcinoma

Patients who had complete response or partial response after at least 3 cycles (no more than 6 cycles) of chemotherapy combined with immunotherapy receive local radiotherapy 21 days. For those non-CR oligo-metastatic disease or symptomatic lesion, SBRT or conventional RT delivered. Maintenance therapy of immunotherapy for 2 years.